Rinoa Weapon:

Rinoa's weapon is called the Blaster Edge and it is attached to her left wrist and she fires at the enemy. The item fired returns back to Rinoa, then awaits her turn to attack again.

Like everyone else's weapon, Rinoa's can be upgraded by remodeling when the correct items are found and if the weapons magazine is read. Here are the remodels of Rinoa's weapons:

Pinwheel: This is the weapon that Rinoa starts off with. To get this item again later on in the game, you would need 3 M-Stones.

Valkyrie: This is Rinoa's second weapon. To get this item, you would need one shear feather and one M-Stone.

Rising Sun: This is Rinoa's third weapon. To get this item, a saw blade and 8 screws are necessary.

Cardinal: Rinoa's fourth weapon. A Cocatrice Pinion, a Sharp Spike and a Mesmerize Blade are needed to remodel to this weapon.

Shooting Star: Rinoa's ultimate weapon. To be able to remodel to the Shooting Star, you would need 2 Windmills, a Regen Ring, a Force Armlet, and 2 Energy Crystals.

It is not necessary to go in this particular order in weapons. One can skip weapons as long as they have the proper items and the right magazine read to get the weapon desired.